《全球定位系统（GPS）测量规范》规定，D级GPS控制网的闭合环或附合路线边数应（）。

A．≤5

B．≤6

C．≤8

D．≤10

When I lived with my roommates in the university, we ________ often talk into the night.

A．might

B．could

C．should

D．would